词语填空通读下面的短文， 掌握其大意，然后从各题所给的A,B,C三个选项中选出最佳答案

I am not a brave girl, and even a little mouse scares(惊吓) me.1 I’ve been crazy about bungee jumping(蹦极). One day, I found a good place for this exicing2in Thailand by surfing the Internet. I packed my bag and flew there. However, I had no idea how to get to the address listed on the3. I called them and took a taxi, but the taxi driver didn’t know the way, either. He dropped me halfway.

Having bought some bread, I had to wait for the car that was supposed to pick me up. Just then a young man jumped out of a car and asked if I was Jenny. Then we 4 to the bungee jumping place. I was amazed by the sights along the road through the window of the car.

I quickly signed an agreement which said I I might die, and5 a harness(安全带). The guide led me through a gate, asked me to sit in a special seat and tied my 6and ankles(踝) well。

I was nervous but not scared. As soon as I stood up and felt my ankles7together, I got scared, I walked slowly to the edge(边) of the bridge and looked back. The workers looked at me and couldn't help laughing. At last it was time to go. So I jumped as 8forward as I could.

  At that moment my memory seemed to stop. I felt 9 going up, like riding a fast lift, and them another drop and… Finally, I stopped in the air. I spread my arms wide, laughing loudly and 10. The workers pulled me up, smiling at me.

植物的生长需要多种矿质元素，其中必须元素就多达14种，需要量比较大的有氮、磷、钾、钙、镁、硫、铁等．为了探究植物根系是否等比例吸收矿质元素和水分，兴趣小组的同学设计了如图所示装置，选用两株各方面均相同的水稻，通过改变光照来调节蒸腾作用，然后测定水稻根系所处溶液中矿质元素含量的变化．

【提出假设】植物根系等比例吸收矿质元素和水分．

【实验设计】根据上述研究目的，设计相应的实验方案及记录表如下：

为了确保上述假设的普遍适用性，表中的X、Y等应为____ ．

【数据处理】要初步证实假设成立与否，实验后对表中的数据应按下列____ 方式处理．

A．比较m₁：m₂和n₁：n₂两个比值   B．比较m₁+n₁和m₂+n₂的大小   C．比较m₁﹣m₂和n₁﹣n₂的大小  

【实验结论】植物根系不是以等比例的方式吸收矿质元素和水分．

【实验反思】

①  本实验采用改变光照来调节水分蒸腾量，但在实验设计中，我们也可以在相同的光照条件下，通过改变水稻植株上的____ 来进行实验；

②  实验小组通过探究后否定了他们在开始时提出的假设．对于他们的这次探究活动你认为是否有价值？____ ．

选择最佳应答语（  ）